Grimes s Malicious Mobile Code (O Reilly & Associates, 2001) is a solid text that discusses Windows viruses and Trojans. It focuses on the desktop, not perimeter or server scanning, but it s a good guide to desktop virus protection.
Viruses Revealed (by Harley, Spafford, and Slade; Osborne McGraw-Hill, 2001) is an authoritative reference covering malicious code, including some fascinating historical material and a useful guide to choosing antivirus products.
Rob Rosenberger s Virus Myths ( http://www.vmyths.com ) is an occasionally entertaining site dedicated to deflating the hype surrounding virus outbreaks. Although often abrasive, the author s points about the media s unfortunate tendency to overhype trivial virus threats are well taken.